Jai Maa Saraswati Om Namh Shivay Jai Ganeshay Namh Om Guru.

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Presentation transcript:

Jai Maa Saraswati Om Namh Shivay Jai Ganeshay Namh Om Guru

Lecturer in the Dept of Physics at UTA Nilakshi Veerabathina (Nila)

Astr1010, Spring 2003 class (Georgia State University)

Astr1020, Spring 2003 class (Georgia State University)

Astr1010, Spring 2003 (Georgia State University) Final Display of Posters by my students

Research…….. huummm Observational astronomy Structure of Star Clusters (best laboratories) Gamma-Ray Bursts (most powerful event) Meteor Shower (One of the most spectacular events)

Globular Star Clusters Open …. Image credit: antwrp.gsfc.nasa.gov/ apod/image/0409/antwrp.gsfc.nasa.gov/ apod/image/0409/ M55 M 7 From DSS of USNO 43 rich open clusters of all ages (6 Myr – 8 Gyr), located in all directions of Galaxy.

Density(star/arcmin²) Core radius = OC Cluster radius = OE Width of coronal region = CE Theoretical Stellar Radial Density Profile (RDP) O C E Radius (arc min)

 Area ~ 40 x 40 arcmin² ~ 24 x 34 arcmin² Telescope 105 cm Kiso Schmidt 104 cm Sampurnanand (Japan) (Nainital, India) Photometry stars (cluster), 2180 (field) Filters U B V I B V I CCD 2k x 2k 2k x 2k Lie in Cassiopei a Lie in Auriga CCD photometry of NGC 7654 NGC 2099

104 cm Sampurnanand Telescope (NainiTal, India)

One of the largest Schmidt telescopes of the world, Nikon 105 cm Schmidt Telescope (Institute of Astronomy, University of Tokyo, Japan)

Data Reduction Procedure

Most energetic events of the Universe Gamma-Ray Bursts 2704 bursts detected by the Burst and Transient Source Experiment (BATSE) aboard the Compton Gamma-Ray Observatory

GRB Distance ~ 5 billion pc GRB Distance ~ 3 billion pc Gamma-Ray Bursts

GRB was the first afterglow of gamma-ray burst observed from Indian soil. We Made the History The effect of magnetic fields on gamma - ray bursts inferred from multi-wavelength observations of the burst of 23 January 1999 ( Nature 1999, 398, ), T.J. Galama et al. including Nilakshi. Decay of the GRB optical afterglow: implication for the fireball model ( Science 1999, 283, ), A.J. Castro - Tirado et al. including Nilakshi.

From comet Tempel-Tuttle Leonid Meteor shower Image Credit: LeonidMeteors.cfm

Do Astronomers Have to Work All Nights? Credit:cartoonstock.com